Show breeding is effectively the worst thing to ever happen to dogs. A century or two of breeding to arbitrary cosmetic standards, not to mention inbreeding, mean that most breeds that are up to show standards have some pretty significant health and functionality problems, all so people can parade around funny-looking animals that adhere to arbitrary specifications. The BBC did a pretty good special on this a few years ago.
The sad fact is that when you look at a purebred dog and think it looks a little deformed, that's because it is, and because we made them that way. People have selectively exaggerated their traits for long enough that their unique traits, far from being the kind of strange adaptations you see in lots of animals, are pretty much just deformities perpetuated and encouraged across generations that tend to result in significant problems. For example, bulldogs can hardly even give natural birth anymore (apparently 80% are through caesarian section), and some toy dog breeds with flatter skulls/faces tend to have eye and breathing problems for that reason. There's this little Pekingese owned by someone I know who can barely breathe out of his nose and whose eyes barely point in the right directions at all, because humans have decided that having a squashed skull looks cute or something.
Kennel club standards have certainly gotten a little better, but only very recently and due to PR backlash from things like the aforementioned BBC special. It just seems sad to me that humans are so concerned with having adorable animals that we'll willfully breed less healthy, less functional ones, prone to sometimes severe health problems and inbreeding, and exaggerated traits that don't make any sense or provide for the animal's well-being in any way, just to parade them around on a stage and get a ribbon for how much your individual animal fits an arbitrary cosmetic specification more than someone else's. If people want to talk about the dangers of genetically modifying organisms, dogs are a pretty good place to start, and we managed that using nothing but selective breeding.
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I know i wish you could use mutts in shows but the dog shows are to show the best of a breed. So then after you find the breed you like you can breed it with another you like. But youve got to know how it should walk, run, look, and sound. Thats why i like dog shows.